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Employee Benefit and Deferred Compensation Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost | $ 0 | $ 0 | $ 0
Interest cost | 1,043 | 1,168 | 1,216
Expected return on plan assets | (2,077) | (1,941) | (1,872)
Prior service cost recognized | 0 | 0 | 0
Recognized actuarial loss | 328 | 401 | 404
Settlement/curtailment/termination losses | 0 | 0 | 0
Net periodic benefit cost | (706) | (372) | (252)
Net actuarial (gain) loss arising during the period | (173) | (1,051) | 5
Net Settlement/curtailment/termination losses | 0 | 0 | 0
Amortization of net actuarial loss recognized in net periodic pension cost | (328) | (401) | (404)
Total recognized in other comprehensive income | (501) | (1,452) | (399)
Total recognized in net periodic benefit cost and other comprehensive income | $ (1,207) | $ (1,824) | $ (651)
Discount rate used to determine net periodic pension cost | 3.96% | 4.35% | 4.56%
Expected return on plan assets | 6.00% | 8.00% | 8.00%
Pension Benefits | HeritageBank |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost |  |  | $ 0
Interest cost |  |  | 172
Expected return on plan assets |  |  | (113)
Prior service cost recognized |  |  | 0
Recognized actuarial loss |  |  | 0
Settlement/curtailment/termination losses |  |  | (780)
Net periodic benefit cost |  |  | (721)
Net actuarial (gain) loss arising during the period |  |  | (397)
Net Settlement/curtailment/termination losses |  |  | 780
Amortization of net actuarial loss recognized in net periodic pension cost |  |  | 0
Total recognized in other comprehensive income |  |  | 383
Total recognized in net periodic benefit cost and other comprehensive income |  |  | $ (338)
Discount rate used to determine net periodic pension cost |  |  | 4.27%
Expected return on plan assets |  |  | 3.00%
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost | $ 8 | $ 9 | $ 12
Interest cost | 31 | 42 | 58
Expected return on plan assets | 0 | 0 | 0
Prior service cost recognized | 0 | 0 | 0
Recognized actuarial loss | 0 | 6 | 76
Settlement/curtailment/termination losses | 0 | 0 | 0
Net periodic benefit cost | 39 | 57 | 146
Net actuarial (gain) loss arising during the period | (240) | (328) | (56)
Net Settlement/curtailment/termination losses | 0 | 0 | 0
Amortization of net actuarial loss recognized in net periodic pension cost | 0 | (6) | (76)
Total recognized in other comprehensive income | (240) | (334) | (132)
Total recognized in net periodic benefit cost and other comprehensive income | $ (201) | $ (277) | $ 14
Discount rate used to determine net periodic pension cost | 3.37% | 3.57% | 3.63%

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- Definition Before tax amount of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost. + References No definition available. + Details
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- Definition Defined Benefit Plan, Amounts Recognized In Other Comprehensive Income, Net (Losses) Gains Due To Settlements, Curtailments, And Terminations + References No definition available. + Details
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- Definition Before tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost. + References No definition available. + Details
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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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